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` Sewing Machine. Y No. 80,907. ParentedAug-^1m68y N. PETiRs. PhomLm-wgmphor. wnshingtm D. c,

A. n. BYRKiT VAND c. s. BYRKIT, 0F FAIRFIELD, iowa.

Letters ,Patent No. 80,907, dated August 11, 1868.

IMPROVEMENT IN SEWING-ll/IAGlElINE.

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TO 4ALL WHOM IT MAY CONCERN: Y l

Be it known that we, A. R. BYRKIT and C. S. BYnKIT, both of Fairieldfin the county of Jefferson, and

` tai',e of Iowa, have invented a new and useful Improvement in Sewing-Machines, of which the'following is a full, clear, and exact description,reference being had to theaccompanying drawing, forming part of this specification, and in which-` Figure 1 represents a side elevation of a sewing-machine constructed according to our improvement. Figure 2, an inverted plan-ofthe same, and j i i Figure 3 a partlysectional front elevatiom'onfa larger scalc'rthan. the previous figures, ofthe lower portion of the machine, from the table do`nwnwards,iin illustration of theshuttle and -feeding-bar#operating mechanism. v Similar letters of reference indicate corresponding parts throughout the4 several gures. This, our improvement, relates, in one of its features, to that class of machines in which a double-pointed shuttle is used for carrying a secondary or locking-thread through the-loops'left or formed' by the needle-thread in both directions of the shuttles throw, first passing the secondary thread, through aloop of needle-thread, in

'the direction ofthe feed, and through the next loopoi` needle-thread in a contrary direction. In this connectionthe invention' embraces an oblique set or arrangement, relatively to the feed, of the shuttle-race and shuttle or its carrier-arm; likewise, a heart-shaped cam, in combination with the feed for operating the latter, in whichever direction the machine is run; also, a peculiar combination of devices for eifecting and regulating the feed, all substantially as hereinafter described. f v e "Referring to the accompanying drawing, it will only be necessary hereto describe at length those parts of the machine to which the improvement relates, or that are more immediately connected with it. In said drawing-S represents a mainor driving-shaft, on which may be arranged a grooved cylinder, l?, forgiving motion to a needle-levier, E, 'that` imparts the necessary Avertical reciprocating action to the needle-bar El, carrying the usual eye-pointed needlee, which maybe supplied with thread from a-reel in rear of the machine, subject to the control `of ordinary or any suitable tension-devices, that, together with the presser-foot and other common or well-known parts, need no particular reference.

The cloth-table E? is here shown as arranged above thebed-plate E3 of the machine, with a block or framepie'ce,f, disposed between them, but such construction may be changed.

C is the shuttle-arm or carrier-operating lever, working on a fnlcrurn or pivot, as at g, that projects from a lower standard, 71..

D is a wheel or disk, made fast to the shaft` S, and formed, on its one side or face, with an endless gioove, s s, o f the configuration represented by dotted lineslin iig. 3, and with which a double-pointed" shoe or driver, m, pvoted to thelever C, gears, for the purpose of giving a .forward and backward motion to said lever, with its carrier and shuttle, the groove s s, by its configuration, moving the lever C forward, or in one direction of its throw, during one revolution of the disk D and its shaft S, and in a backward or opposite direction during the next revolution, in whichever direction the machine is run, that is, during reverse motions of the shaft S, and giving a single throw to the shuttle during a double, thallia, one'up-and-down movementfotl the needle.

A is the double-pointedshuttle, which is freely or loosely borne bya'suitably-constructed carrier, B, so as, inthe reciprocating actioniof the shuttle across the path of the needle, and in directions approximating Vto the feed, and oppositcly thereto, to pass the shuttle, with its secondary thread, through the ioopor loops of the needle-thread. The face of the shuttle A works against or in close proximity tothe face side ofthe shuttle-l bed'or race R, which is set obliquely to the'feed, and the lever C, or its pivot g, correspondingly pitched or set, so that the shuttle-thread lies, as 'it were, in front of the needle when the shuttle is at the extremity Iof one of its strokes, and behind it when at thc end of its opposite stroke, and ncarer to the operator by reason ofthe Obliquity of the shuttles course 'across the machine. This oblique action ofl the shuttle obviates the twill," which is characteristic of machines of this class, by reason ofthe peculiarity of the stitch or passage of the secondary thread in opposite directions from the double-pointed shuttle through the successive loops lof thc needle-thread, rstly in direction of the feed, and next reversely thereto.

sopor 2 Motion is given to the feeding-bar V by means of a heartshaped cam, N, arranged-to rotate with the shaft i S, said cam imparting an up-and-down motion to a pitman, M, through studs or projections u, and said pitman carrying, at or near its upper end, a button, K. This button K, as it is moved down, comes in contact with a bent lever, L, which lifts the feedbar V to bite the cloth', and then strikes or` acts upon a lower projecting end of a beam or rocking-plate, pivoted as at a, which draws forward a connecting-rod, Gr, carrying with it the feed-bar V, to which said rod is attached. The rod G is connected with the one arm of the rocking-plate J by or through a slot, r, so that by working to the right or left, a lever, H,- which is in slotted gear with the rod G, the leverage at which the plate J acts upon the rod G maybe altered to give more or' less stroke to the feed-bar V, accordingly as a long or short stitch is required. In the upward stroke of the button K, the action ofthe feedbar is reversed, said bar, with its appendages, dropping to release the cloth, and the buttonstriking and acting upon the upper arm o'i the beam or rocking-plated to work the feed-bar V backwards. The ac'tiou of the feed is the same, in whichever direction the machine is run, and the heart-shaped cam N admits of the machine being reversed at any time without missing a stitch.

What is'hercclaimed', and desired to be secured lay-Letters Pate/nt, is

1. The combination, with the shuttle face-plate, arranged obliquely to the feed-movement, of the obliquelymoving vibrating-carrier and double-pointed shuttle, substantially as 'and for the purpose set forth.

2. The combination of the heart-shaped cam N with. the feeding-mechanism described, for operating the feed, in whichever direction the machine is run, essentially as herein set forth.

' i A. R. 'BYRKIT o.. s. BYRKIT.

Witnesses:

0. J. FULLER, M. L., BYnm'r. 

